Daniel Wenger1,2, Karolin Petersson3, Cecilia Rogmark3,4. 1. Lund University, Lund, Sweden. daniel.wenger@med.lu.se. 2. The Department of Orthopedics, Skåne University Hospital, Inga Marie Nilssons gata 22, 205 02, Malmö, Sweden. daniel.wenger@med.lu.se. 3. Lund University, Lund, Sweden. 4. The Department of Orthopedics, Skåne University Hospital, Inga Marie Nilssons gata 22, 205 02, Malmö, Sweden.